How to add ADD TO CART button on home page and catgory

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<?php if ($ajax) { ?>
<script type="text/javascript"><!--
$(document).ready(function () {
	$('.addtocart').replaceWith('<a onclick="" class="button addtocart">' + $('.addtocart').html() + '</a>');
	
	$('.addtocart').click(function () {
		var pid = this.parentNode.id;
		$.ajax({
			type: 'post',
			url: 'index.php?route=module/cart/callback',
			dataType: 'html',
			data: $('#'+this.parentNode.id+' :input'),
			success: function (html) {
				$('#module_cart .middle').html(html);
			},	
			complete: function () {
				var image = $('#img_'+pid).offset();
				var cart  = $('#module_cart').offset();
	
				$('#img_'+pid).before('<img src="' + $('#img_'+pid).attr('src') + '" id="temp" style="position: absolute; top: ' + image.top + 'px; left: ' + image.left + 'px;" />');
	
				params = {
					top : cart.top + 'px',
					left : cart.left + 'px',
					opacity : 0.0,
					width : $('#module_cart').width(),  
					heigth : $('#module_cart').height()
				};		
	
				$('#temp').animate(params, 'slow', false, function () {
					$('#temp').remove();
				});		
			}			
		});			
	});			
});
//--></script>
<?php } ?>

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	<div class="heading"><?php echo $text_latest; ?></div>
    <table class="list">
      <?php for ($i = 0; $i < sizeof($products); $i = $i + 4) { ?>
      <tr>
        <?php for ($j = $i; $j < ($i + 4); $j++) { ?>
        <td style="width: 25%;"><?php if (isset($products[$j])) { ?>
          <?//to adding AddToCart Buttons MO.?>
		  <a href="<?php echo str_replace('&', '&', $products[$j]['href']); ?>"><img id="img_product_<?php echo $products[$j]['id']; ?>" src="<?php echo $products[$j]['thumb']; ?>" title="<?php echo $products[$j]['name']; ?>" alt="<?php echo $products[$j]['name']; ?>" /></a><br />
		  <?//End adding AddToCart Buttons MO.?>

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		  <? // adding buttons add to cart MO. ?>
		  <form action="index.php?route=checkout/cart" method="post" enctype="multipart/form-data" id="product_<?php echo $products[$j]['id']; ?>">
            <input type="hidden" name="quantity" value="1" />
              <a onclick="$('#product_<?php echo $products[$j]['id']; ?>').submit();"  class="button addtocart"><span><?php echo $button_add_to_cart; ?></span></a>
            <input type="hidden" name="product_id" value="<?php echo $products[$j]['id']; ?>" />
         </form>
		  <? // adding buttons add to cart MO. ?>
          <?php if ($products[$j]['rating']) { ?>

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				$this->language->load('common/home');
		$this->language->load('product/category'); // Mo add 10.5.2010
		$this->document->title = $this->config->get('config_title');

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		$this->data['text_latest'] = $this->language->get('text_latest');
		// Mo adding 10.5.2010
		$this->data['button_add_to_cart'] = $this->language->get('button_add_to_cart');
		$this->data['ajax'] = $this->config->get('cart_ajax');
		// Mo END

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          	$this->data['products'][] = array(
           	'id' 	   => $result['product_id'],  // Mo add 10.5.2010
			'name'    => $result['name'],
				'model'   => $result['model'],
            	'rating'  => $rating,
				'stars'   => sprintf($this->language->get('text_stars'), $rating),
				'thumb'   => $this->model_tool_image->resize($image, $this->config->get('config_image_product_width'), $this->config->get('config_image_product_height')),
            	'price'   => $price,
				'special' => $special,
				'href'    => $this->model_tool_seo_url->rewrite(HTTP_SERVER . 'index.php?route=product/product&product_id=' . $result['product_id'])
          	);